4 Equivalent Circuit Model of LCS

Understanding a piezoelectric device equivalent circuit is crucial for analyzing and designing systems because this simplifies the complex electromechanical interactions into a manageable electrical model, enabling prediction and optimization of performance. There are multiple models to simulate the behaviors of the piezo and here we provide an example. In the example, the LCS consists of a bulk resistor and a bulk capacitor, along with several LRC networks, all connected in series, as shown in Figure 4-1. Each RLC portion represents the mechanical properties, such as mass (L), compliance (C), and mechanical damping (R), while the serial bulk capacitor and resistor represent the electrical capacitance and resistance of the device electrodes.

Figure 4-1 Equivalent Circuit Model of LCS

Figure 4-2 illustrates the impedance response comparing the lab data with simulation data from the model. The lab results align closely with the simulation model, given the passive component values used in the table.

Figure 4-2 Impedance Response of LCS: Lab versus Sim